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RE: Column Tilting Steel Erection

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Rand,
Per OSHA 1926:

§1926.756 Beams and columns. 


This section of the standard focuses on increasing safety for employees involved in connecting solid web beams and columns. 


Requires that solid web structural members remain attached to the hoisting line until members are secured with at least two bolts per connection drawn up wrench tight [§.756(a)(1)]

Competent person shall determine if more than two bolts are necessary to ensure the stability of cantilevered members [§.756(a)(2)]

Solid web structural members used as diagonal bracing shall be secured by at least one bolt per connection drawn up wrench tight [§.756(b)]

Requires that one wrench-tight bolt or a seat (or seat equivalent) secure the first member and column throughout the entire double connection process [§.756(c)]

Requires column splices to be designed to resist a minimum eccentric gravity load of 300 pounds (136.3 kg) [§.756(d)]

Sets requirements for the erection of perimeter columns [§.756(e)]



One of the things this addresses is the need for the erector to keep the column "on the hook" of the rig while it is being tilted. Due to the presence of stiffeners on the column above and below the connection, the erector must tilt the column to fit the connecting beam between the supporting columns. There have been occasions where the erector has tilted the column after it is released from the rig, and the column has actually fallen over and caused injury or death. The 4-bolt anchor rod requirement also helps address this problem during erection.


HTH,

Randall H. Collier, P.E.



-----Original Message-----
From: Rand W Holtham [mailto:RHoltham(--nospam--at)CBI.com] 
Sent: Monday, July 24, 2006 1:14 PM
To: seaint(--nospam--at)seaint.org
Subject: Column Tilting Steel Erection






List,

I've been told that erectors are not allowed by OSHA to tilt columns to
facilitate erection, but no one can tell me where that appears in writing
can anyone fill me in?


Thanks,
Rand


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